From edee8361d75715b9bc020d76fa8f38b005a6e912 Mon Sep 17 00:00:00 2001
From: David Anderson <dvander@google.com>
Date: Wed, 16 May 2018 13:43:22 -0700
Subject: recovery: add --fsck_unshare_blocks option for adb remount

Allow "adb remount" on deduplicated filesystems to reboot into recovery
and run e2fsck to undo deduplication. The e2fsck binary is copied from
the system partition into tmpfs, and the system partition is unmounted
so e2fsck can run safely.

Bug: 64109868
Test: recovery with --fsck_unshare_blocks; adb remount
Change-Id: I7558749b018b58f3c4339e51a95831dbd5be1ae3
---
 recovery.cpp | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

(limited to 'recovery.cpp')

diff --git a/recovery.cpp b/recovery.cpp
index 56b2567d1..98cbfed2f 100644
--- a/recovery.cpp
+++ b/recovery.cpp
@@ -55,6 +55,7 @@
 #include "adb_install.h"
 #include "common.h"
 #include "device.h"
+#include "fsck_unshare_blocks.h"
 #include "fuse_sdcard_provider.h"
 #include "fuse_sideload.h"
 #include "install.h"
@@ -969,6 +970,7 @@ Device::BuiltinAction start_recovery(Device* device, const std::vector<std::stri
                  [](const std::string& arg) { return const_cast<char*>(arg.c_str()); });
 
   static constexpr struct option OPTIONS[] = {
+    { "fsck_unshare_blocks", no_argument, nullptr, 0 },
     { "just_exit", no_argument, nullptr, 'x' },
     { "locale", required_argument, nullptr, 0 },
     { "prompt_and_wipe_data", no_argument, nullptr, 0 },
@@ -997,6 +999,7 @@ Device::BuiltinAction start_recovery(Device* device, const std::vector<std::stri
   bool sideload_auto_reboot = false;
   bool just_exit = false;
   bool shutdown_after = false;
+  bool fsck_unshare_blocks = false;
   int retry_count = 0;
   bool security_update = false;
   std::string locale;
@@ -1014,7 +1017,9 @@ Device::BuiltinAction start_recovery(Device* device, const std::vector<std::stri
         break;
       case 0: {
         std::string option = OPTIONS[option_index].name;
-        if (option == "locale") {
+        if (option == "fsck_unshare_blocks") {
+          fsck_unshare_blocks = true;
+        } else if (option == "locale") {
           // Handled in recovery_main.cpp
         } else if (option == "prompt_and_wipe_data") {
           should_prompt_and_wipe_data = true;
@@ -1181,6 +1186,10 @@ Device::BuiltinAction start_recovery(Device* device, const std::vector<std::stri
     if (sideload_auto_reboot) {
       ui->Print("Rebooting automatically.\n");
     }
+  } else if (fsck_unshare_blocks) {
+    if (!do_fsck_unshare_blocks()) {
+      status = INSTALL_ERROR;
+    }
   } else if (!just_exit) {
     // If this is an eng or userdebug build, automatically turn on the text display if no command
     // is specified. Note that this should be called before setting the background to avoid
-- 
cgit v1.2.3